Step-by-step explanation:
Hope it helps man .. ....
For this case we have that by definition, the equation of a line of the slope-intersection form is given by:

Where:
m: It is the slope of the line
b: It is the cut point with the y axis
By definition, if two lines are perpendicular then the product of their slopes is -1.
If we have: 

Thus, the equation is of the form:

We substitute the point:

Finally, the equation is:

Answer:

1800 gal converts to 7200 quarts, and divide that by 60 you get 120 quarts of water per second.
Answer:
D. is the correct one.........
0.7 + 0.4 + 0.6 + 0.4 = 2.1 is the perimeter
0.7 x 0.4 = 0.28
0.6 x 0.4 = 0.24
0.28 + 0.24 = 0.52 is the area
Hope that helped!